DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 124 (Engine Control System (A25A-FXS) - Diagnostic Codes (P1362-P16B0)) >> SFI System >> DTC P1420-00: Evaporative Emission Canister (Small Leak); DTC P1421-00: Evaporative Emission Canister (Gross Leak) [10/2022 - 11/2023] >> DTC Summary

DTC Summary

WARNING: This page is about a different variant/trim than selected.
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P1420-00 Evaporative Emission Canister (Small Leak) Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at the start and at the end of leak check. If stabilized pressure is higher than second reference pressure, ECM determines that EVAP system has a small leak.
  • EVAP leak (purge VSV - canister - fuel vapor-containment valve)
  • Purge VSV
  • Connector/wire harness (purge VSV - ECM)
  • Canister pump module
  • ECM
Comes on DTC stored
  • SAE Code: P1420
  • DTC for Mexico Models: Does not apply
P1421-00 Evaporative Emission Canister (Gross Leak) Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at the start and at the end of leak check. If stabilized pressure is higher than [second reference pressure x 0.2], ECM determines that EVAP system has a large leak.
  • EVAP leak (purge VSV - canister - fuel vapor-containment valve)
  • Purge VSV
  • Connector/wire harness (purge VSV - ECM)
  • Canister pump module
  • ECM
Comes on DTC stored
  • SAE Code: P1421
  • DTC for Mexico Models: Does not apply
DTC No. Monitoring Item Detection Timing Detection Logic SAE Code
P1420-00 Small leak from canister EVAP monitoring
(ignition switch off)
2 trip P1420
P1421-00 Gross leak from canister P1421